doc: Use other doxygen feature to specify mainpage #387
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Previously a special tag was added to README.md to make this the
main page in Doxygen generated docs. When viewing the README on the
GitHub page this tag was not hidden.
After upgrading to Doxygen 1.8.8 (and above) in changeset
2190257 a new Doxygen feature can be
used to specify the main page: Since release 1.8.3 Doxygen has a special
option to set a markdown file as main page. When using this option we
can drop the tag, making the README rendered by GitHub nice to look at.
Fixes: ae66b24